Portable fan



FIG. 1 is a top, front and right side perspective view of a portable fan in accordance with our invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof that is identical/symmetrical to the left side thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, rear and left side perspective view thereof.

The broken line showing of environmental structure in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable fan, as shown and described. 